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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af37954d29d14d8cad06e342a94eb76cb33c9d1a8cf5685012bb1db42cf428ac' 
  AND token = 'tyWbaoVQ2+ZXTlvxnJXaQTjilIZrcjevYcHNI9XaWdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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