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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e62a534e7b64c2f5bf36636009367715c8dd02a07ebe303face4e4126c5ea621' 
  AND token = '1G7KIOjD3YIeiqMmqZju1B52y5jPycxcrCRb4cOKP5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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