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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d51fd3296f6d82881df7836b2519e9d128dad1929d29638731e42fa0a2429c0' 
  AND token = 'U+EU5iZvmVa620Df3CRVwaA+Kyraeapp8FqAESzIfvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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