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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1df62e48e60100988048f44356baa010a54f34839aa7f4bda94c6b24fc063edd' 
  AND token = 'vWSz84682HdaXz6kdEL7a5EkyN/IXFyHFy4w6XbSQYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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