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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b6e83630680fda0bfbfa09a7a5b97f95d728bf41fd7a6f70089afe4faeed40f' 
  AND token = 'kGv+/G65hhiO7dERHIdytq7eo80kGKXLNRU9/myLsl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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