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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d82fa1909d85c097b49d7e148b56b20897675db7a3470c905596557677b69c0' 
  AND token = '++h3CjJ1bBOwnjx2z8C32G47OeWoLa0tTzsLlue9a48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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