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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334835cb4d839be01ca8d56d28f8b96800368adca6ad0a05cb099cf7caa4c68b' 
  AND token = 'Tul6ctiUybV3ROVSD0OqmQG9ixGCvBxbzG26xy8dpfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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