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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50cb4b72dd2a6d4415e5f9fe0660e1e9aa6baf2af56c1ec91558f3c032dc0a9f' 
  AND token = '+aROjSb5X0FMLXs+kTzHb90cwQeKGf3Nd3Cd8QoG9dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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