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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2679aa1e027c323b9b34411f14994375d4c9ac866098374d24378724e21bb3b4' 
  AND token = 'NWxg/jRr2RYHQqL0d2xdDe0eXVUa1P8k5mhuXf8I8l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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