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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb2e308ffe3f9245c71d9037f1f1101ca47553429b3927fd386086aa7f0d0b6' 
  AND token = '7DvIdOrg8bi8CJF04aFQTPgXxn4NX4QctRnBzrg26pY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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