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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ff90d70093b64b81a4834fa24e790acd2000b5a571d67afffdb920e0033d30' 
  AND token = '83mcJQyC2rj2vcrSsU81gPhMFHUKr7rR6bv77VM5fcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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