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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6b34f4ae2750eab4f96db8a653b8b246a741e95593e1a63f577a73bc9622a81' 
  AND token = 'GjNxV2te8jw67Y2coNhljI1xspmQbz5L8XiOVn+zkvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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