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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c9e56cc09546b50eded2820414f928de3ab7d1d6bb80f7a7bec5c26bab40543' 
  AND token = 's9M54moc+DNIAD1sZFwpITPOsSQtP4IShaPKQwg3de0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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