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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b4d736c539154db0d0f2e4c76a9776b3f67c98975977ff869346e07871cd75c' 
  AND token = 'jVSnLWHVcyPRmFdPGD0369w+TyLmfTQk2Jpr2WkRyqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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