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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9697bc13a044f8d1a586c2b88b65c6f086ad9bb4a58946ec81fb441350bdef32' 
  AND token = 'J3PYFsW1k1hT/hW5s4j6e78rdkkiHqYmj66yfinCUBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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