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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd67e133f7a4ee1f6878595d279928e1718824d03c3d471b0639063213332a6' 
  AND token = 'p7Z8+EyFHLcCrNeA0ybJalN3gJBpouJ9AnmwU+aS91k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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