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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21c40a750d74caf097caf6e9316bba67c10c562e89ec9c74ca4ea47cb0ad7864' 
  AND token = 'A0gZHAjoS8RI2nJVZQmylEO8/Cbq9t++L9eWKige/vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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