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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e13b2d867f7c5d3c8dc876b1963c2f6f60bd054e8ca2562850506c246859cf3' 
  AND token = 'T/eINVJF1rLr41Y/yniQT5xdZcBzvi/L5HNaPtRbVeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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