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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbcb679cc3c2e93da04aed50f8f1e4a6a2b4c4c242bc51ee763af04f5785e467' 
  AND token = '6kcISPThIKEXMropphpHgwur/nWdL/SjDNvkh3mp4VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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