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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f363fa1a499622c5a24d6fa2e94891a896e94ffe562602af85307cb605ec6c31' 
  AND token = '5Bmvp+9xegrAVeF5vcvuSiLS6vUXSDv1zg7/dyYzD8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}