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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee85b722cf763f19e45b8a8783983532392ca86202bc43ba3ef91151a3d8939f' 
  AND token = 'QcjOIbRaK2UFICda8IHRQtROE4S5ZEwg7JdaStAhpI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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