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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00af331776b8c2c96b101814da2a40fb352ff513e55ce8c78622611985f076e1' 
  AND token = 'lvweymMSvrB4S6DuzhuwRnJO0bqhT4pVkU7ONNZCS8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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