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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bce29f4b99fe63a54ace3c844940974f6992cdfbde0b714830f986268c4dc4a7' 
  AND token = 'f531kpWRgFu4OQ6XryN8yDh+Olp6u7cOkF8Piua+hPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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