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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c54699d77ec8e1080a52a083785e9e1d0a22d07fac2997017950c70b76bb40e7' 
  AND token = 'puWxkEyqHwmHgx1OXPaRN0zG8sN6NiEfgV0dWdPYdEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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