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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09a0efe4889451074cb43c333903611febef89ebd37b3b06cffc9ed50d03a4b6' 
  AND token = '1WM1M4tdJvDSgEXQX4chwYOLuGE8/AXgeMkTfURr1wA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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