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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb463d97a45bf0e51851ba361425c92ae1c4cc0063b0b9e23e41e9c83f989be5' 
  AND token = 'hHzAgRubY+D75oZwGotYX60z7E0NuaXJr6JE1UaESZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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