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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c39274e84200151cc2d49f0171ac1f2bc5ee07770ad62ae51d7d46087b52e8a' 
  AND token = 'KyhP+5fYQarAXKpSeCvxgcGuLxHTKhvFF9Pz6VvrAuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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