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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa947eadfc4bfd3365d3b5c3de097dca8b83c650189c3f0cd9d37b34d88eca58' 
  AND token = 'Bf/0e/cHLXrfjRjhoRFl+quOWXN3HSGM4BkKl64OhUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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