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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad88a4a74d35dad92e04cbbdd969d8fc82094f0741d262856bb96ab402756b81' 
  AND token = 'Xp+2Ec1rFka8TEX9+A7vkPeP2n2WyPauuulx0s+sLLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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