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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c184df2aa8ef4f9d3da8fde091fdb65aae1cc9c7c9eb6a5f30f26180be232b6' 
  AND token = 'Zt5fzNSBcz/5c0UqlbadqlMRGZ6txWFYZoqtOUUCsFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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