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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c823a27ba21ca2703a82505a0daa3ce0a552b6a7287d47469eba1a449b14283d' 
  AND token = 'IsC9vLezzNi0+2xRUbWy9a6Mp6tZ/1XA2nA/7qZ92g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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