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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d05af4d6170f883a2ab5ab328b446ba6baf55505f4c9adc3fe8ad323629472' 
  AND token = 'YlSxlSkQxhto/wc7TQK7gzz0nmA2xE8A3gaY+zthbbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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