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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479c40c40e1f25b6f38a510de0e5c3b60549e32727606a55946a68d36289b7db' 
  AND token = 'Z5PpsSUaRK1btgiYgW1j49PENlh1R/a6DLO+nXZICoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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