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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3ba2cf176724291f080806efa7fdff7fc998e338688bf9c07fc3bcc2110d669' 
  AND token = 'GkuxHK3ngWkC4wAXIPtEfcjMPB8KMkiq95TZ0RK1K/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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