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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe78b2b49a33d41885df47f88641983eee9b71c87cc0a523381720b1f7d970f1' 
  AND token = 'kuwXbl5xiGsMQE01/mBX0Xsg7+QMDl3niyut49UbP3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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