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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '491c4e3954e96ca595d34bea799d1b0b79ba78dd4a532a0b9f9790be25ef8409' 
  AND token = 'ASlUmKiB7XPJS6THAjcIymOES4WplQbZeDVoZ+F88QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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