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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0f527301f36aaacb1c301702271ff17b9116c76897166264976887e7facc873' 
  AND token = 'V9GivTAgazTw6lJoezCtJ0GfRCReES4xoPcss4hbAY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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