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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '668db29a2e678f50b3c23c4bad9a4269caba50471f2ef2b85b2964a50f750ac2' 
  AND token = 'f+NSXyvQ/Zi57/9WpkELs+BbnAdg7LR6gZ0ByAZbyhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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