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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab74bdee163f6c3faadcb0bb2d85ea5d5d4d26b3bb1852f806c060db82ec8cd1' 
  AND token = 'T2L+TMLPNRxzBKJN62YytEtFyjs7eF2b6y+CYIv/xIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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