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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84cbec591e7b2631a1ee6d5ec06a4a0dcde3b7f16ea0756b120fb5a329517393' 
  AND token = 'HFVlIb7nr9ovuKVeJJdEhQkvyHEx+8CFacaxQZok0vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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