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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67b94e29f4755501287d9389708403383e7ca947f622c4df312666fc6c7bca34' 
  AND token = 'H2a3xSHHSxQC41geYWptTk8+SCIsdP2l1yQdh/DU7D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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