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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba93ee4cb49bc9ed04d36f21160a038986455136fa57a3fb7e1b3d456ac23c7c' 
  AND token = '0jcrr/GI33LF7sK9aOoHihF7dWgrV1S3wWUhWQ9X1ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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