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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6806bf6c600ed3bf5b5a8b15f0b0cc796393dd1cb07f5fde05ae580f44b1fe5a' 
  AND token = '5wNnnxf4peYA80O0JMNlbB2x3qh6GxUZ6hzEOBEGn7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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