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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76a90548409fdd69d54193ca2d0018310ee599d6f903c6a1044b50013adc1d41' 
  AND token = '3w8hzPB4TFwi8ZpXTPUNWuTlzMfKrPS2LWmvrp4OAmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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