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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32314a1590b7149228a101bc85d2f69b2710d9388a9697f8303fae9a491112ca' 
  AND token = 'om/HmW3qROnN/BIeqivBYmFHgokX9ZE/I2mW+a/Mhwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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