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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce0b7158d33119010547cfe24f6f5d9b6c9e7c586a48660e2aa745c6877d7ba' 
  AND token = 'h6W6BdFFat2wXEM7NGECHAaaLXpg67P2DxLaOrGOT7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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