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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa2953e62b951e00312c45c9d1636bf8becaf49d8d3eafb99809569928ff346b' 
  AND token = '9h5EEIse0pzWkLEBli/2yIdt4uQwCIAyUhLmcduDF7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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