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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e3dc8ad7e7f2d9387f6b04ffd0b7883e9c052be236bca68d0fce27e98d66e7' 
  AND token = 'F7uXa/DYVnbqPdw84I32zxtL1eQHQ1jB6rBAnT2Xxf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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