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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f0b02ad3292ca8ed8bfdeda928fca758fd8f77a1f2ee5a8dad3bf5f26792bd7' 
  AND token = 'Y0ALT9uuEcnYzhuN0ob5F2oJ89YVDOsnv0NfcXRBKGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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