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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '699d55a1655e4277d429263359c3cd695981169ca56b4fbf4a8a98a0a8e615f7' 
  AND token = 'Vn43d7b+sC6JN5fxUD1PExZDvsvX0NFjGvZ/WKi+r/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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