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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7383e70b4f3bda1ca02cd61cf1523657b0a9a2bb517df74367b3cffd1b9fa9f' 
  AND token = '1Vb23tLpV6bal8d+h4G9F85dVBZ/Edsdyz7085+Z/qA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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