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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed6528ec18ffe8c8fcc2fb057db87245aeefdde0889b527b4d44fa365360938' 
  AND token = 'Li7cUmCxOkwK0odGMqTPSIrC3sIIDebT98aPM2okwvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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