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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6062cbe8239b9dc97d285a162e4dc2f325aa188dc58506828b61591398d1b7' 
  AND token = '5IoGnMTG/ciOes65ucazT9jyPDxJL6OCyhNMXrD/jL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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