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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '704f8fcb6dc56c37ea008b030c3eee7e2e7e2a8e145934d3f2c4f6a135fac4c6' 
  AND token = '/Fql9cid+vbkwmAxOiGrilwBNP4UgHaykYzokWRk7I4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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