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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515a1c1b25a9cd680de27fe0f5c411e85723fcab9eb85f739b54e3426604fd9f' 
  AND token = 'oe2erEiwZKE9j88szCT9oRisl8qgQwrkYP58Q6bqBtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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